What can heavy smoke accumulation and large crazing indicate in a fire scenario?

Heavy smoke accumulation and large crazing typically indicate a slow heat build-up and a distance from the fire's origin. In a fire scenario, when there is significant smoke presence and the crazer marks can be observed, it usually suggests that the heat has had time to propagate and affect materials without immediate ignition. This pattern is often seen in situations where the area is not yet fully involved or is experiencing a slower progression towards full involvement.

The presence of heavy smoke signifies incomplete combustion, which can occur when the fire is at an earlier stage or when there is insufficient ventilation to allow for rapid fire spread. As material heats gradually, it may start to show signs of degradation or surface changes, like crazing. This contrasts with scenarios where rapid fire spread would generally be characterized by bright flames, higher temperatures near the origin, and a more dynamic combustion process.

In summary, the combination of heavy smoke and crazing indicates a scenario where the fire is not yet aggressively consuming its surroundings, suggesting a slower buildup of heat and indicating a position further away from the actual fire source.